Clinton and the Virginia senator are at Florida International University in Miami, addressing a large crowd about their plans for their campaign. “We're going fight for paid family leave, equal pay for women and raising the minimum wage to a living wage,” Kaine said.

“All his life he has been serving people with his legal services by fighting for the poor and minorities. I think he is a great candidate,” Lopez said. “One thing I like of hi is his religious beliefs.”

Clinton and Kaine are in the battleground state to help launch the Democratic National Convention that's scheduled for next week in Philadelphia.

Clinton used the platform to introduce Kaine and highlight his character and political contributions.

"Make no mistake, behind that smile, Tim also has a backbone of steel," Clinton said. "Just ask the (National Rifle Association). Over and over again he has had the courage to stand up to the gun lobby in their own backyard."

"Decent" is a word used by colleagues and families to describe Kaine.

Kaine, a devout Catholic who was educated by Jesuit priests and supports abortion rights, was painted as a man of faith by Clinton. "In both of our families, faith wasn't just something we talked about at church on Sundays, it was a call to serve others in every way that we can," she said.

Kaine spoke in Spanish many times throughout his speech, a move to connect with South Florida's robust Spanish-speaking communities.

Kaine held nothing back when it came to topics, even asking the audience, if they think Republican presidential candidate Donald Trump paid his fair share of taxes.

"And while we're on the subject of taxes, where are Donald Trump's tax returns?,” Kaine asked the large crowd at FIU. Raise your hand if you think that those returns would show (that) he's paid his fair share of taxes. I don't see a lot of hands.”

"There's one last part of Hillary's plan that means a lot to me personally,” Kaine said. “(It’s) kind of emotional for me and I'll bet it's emotional for (many). It’s how to stem the epidemic of gun violence that kills 33,000 Americans every year. As governor during one of the most horrible shootings in America's history, this issue is very close to my heart."

Clinton, who offered Kaine the vice presidential spot on the Democratic ticket during a phone call Friday, said Kaine cares more about making a difference than making headlines. According to Clinton, Kaine is "everything that Donald Trump and Mike Pence are not. He is qualified to step into this job and lead on Day One. And he is a progressive who likes to get things done." She referred to him as someone who has shown a "lifelong commitment to social justice."

According to aides, Clinton deliberated over a shortlist of potentials vice presidential nominees. However she kept on returning to Kaine because of his readiness for the job and her personal comfort with him.

During the vetting process, Clinton was advised by her campaign chairman, John Podesta that her vice presidential candidate must be "someone who, whenever they walk into a room, you are glad to see them and want to have them as part of any conversation."